形狀記憶材料吸振器於平板結構之振動控制

Vibration Control for a Plate Structure Using Tunable Vibration Absorber Based on Shape Memory Materials

林志哲(Chih-Jer Lin) ； 李春穎 ； 李永勝(Yong-sheng Li)

《中華民國振動與噪音工程學會論文集》 2015 (2015/06) Pp. 355-361

摘要

本研究是研究可調變吸振器（Tunable VibrationAbsorber）來進行結構之減振控制，其中可調式吸振器主要由形狀記憶材料所製成的彈簧與質量塊來構成。其中形狀記憶材料彈簧由形狀記憶合金（Shape MemoryAlloys,SMA）與形狀記憶高分子材料（Shape MemoryPolymer, SMP）來構成雙螺旋彈簧，藉由形狀記憶彈簧的剛性可調之特性來調整吸振器之自然頻率。此形狀記憶材料可透過外部通電產生溫度之刺激，使材料進行相變反應，改變材料的機械性質如楊氏係數與材料阻尼之特性。為了瞭解可調變吸振器之材料特性與振動響應，本研究經由實驗來建立模糊邏輯控制器之專家資料庫，最後進行Type-1模糊控制與Interval Type-2模糊控制之實驗比較，藉由模糊控制器來建立輸入與輸出之非線性映射關係來進行結構減振控制。在實驗中主要研究多自由度結構之減振控制，模擬一個平台受到來源不同方向的振動之情況來進行半主動減振控制。由實驗結果顯示x方向或y方向振動，本論文所提出的方法皆能有良好的減振效果。

關鍵字

形狀記憶材料 ； 可調變吸振器 ； 半主動振動控制 ； 第一型模糊控制 ； 區間第二型模糊控制

並列摘要

A tunable vibration absorber (TVA) is studied and used to suppress the vibration of a structure. In this study, the TVA is composed of a mass and two springs made by two different types of shape memory materials (SMM), which are the shape memory alloys (SMA) and the shape memory polymer (SMP). The vibration characteristic property of the TVA can be changed via tuning the Young's modulus of the two SMM springs, which are influenced by the external applied current source. To understand the vibration characteristic of the TVA, the experiments are designed to establish the expert database of the fuzzy controller, which is used to describe the nonlinear mapping between the input and output. In the case studies, the TVA is applied to the vibration control of a multi-DOF structure to suppress the vibrations which are induced by the external stimulation from the X-axis direction and the Y-axis direction. The resulting experiments validated the ability of the proposed method for the vibration control.

並列關鍵字

Shape Memory Material ； Tunable Vibration Absorbe ； Semi-active vibration contro ； Type-1 Fuzzy control ； Interval Type-2 Fuzzy control ； Tunable vibration absorber